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Enhanced short-wavelength sensitivity in the blue-tongued skink Tiliqua rugosa
School of Biological Sciences, The University of Western Australia, WA, Crawley, Australia; Department of Biology, Lund University, Lund, Sweden; The UWA Oceans Institute, The University of Western Australia, WA, Nedlands, Australia.
School of Biological Sciences, The University of Western Australia, WA, Crawley, Australia; The UWA Oceans Institute, The University of Western Australia, WA, Nedlands, Australia; Oceans Graduate School, The University of Western Australia, WA, Crawley, Australia; Clinical Genetics and Epidemiology, Centre for Ophthalmology and Visual Science incorporating the Lions Eye Institute, The University of Western Australia, WA, Nedlands, Australia.
School of Biological Sciences, The University of Western Australia, WA, Crawley, Australia.
School of Biological Sciences, The University of Western Australia, WA, Crawley, Australia; School of Natural Sciences, Macquarie University, NSW, Sydney, Australia.
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2022 (English)In: Journal of Experimental Biology, ISSN 0022-0949, E-ISSN 1477-9145, Vol. 225, no 11, article id jeb244317Article in journal (Refereed) Published
Abstract [en]

Despite lizards using a wide range of colour signals, the limited variation in photoreceptor spectral sensitivities across lizards suggests only weak selection for species-specific, spectral tuning of photoreceptors. Some species, however, have enhanced short-wavelength sensitivity, which probably helps with the detection of signals rich in ultraviolet and short wavelengths. In this study, we examined the visual system of Tiliqua rugosa, which has an ultraviolet/blue tongue, to gain insight into this species' visual ecology. We used electroretinograms, opsin sequencing and immunohistochemical labelling to characterize whole-eye spectral sensitivity and the elements that shape it. Our findings reveal that T. rugosa expresses all five opsins typically found in lizards (SWS1, SWS2, RH1, RH2 and LWS) but possesses greatly enhanced short-wavelength sensitivity compared with other diurnal lizards. This enhanced short-wavelength sensitivity is characterized by a broadening of the spectral sensitivity curve of the eye towards shorter wavelengths while the peak sensitivity of the eye at longer wavelengths (560 nm) remains similar to that of other diurnal lizards. While an increased abundance of SWS1 photoreceptors is thought to mediate elevated ultraviolet sensitivity in a couple of other lizard species, SWS1 photoreceptor abundance remains low in this species. Instead, our findings suggest that short-wavelength sensitivity is driven by multiple factors which include a potentially red-shifted SWS1 photoreceptor and the absence of short-wavelength-absorbing oil droplets. Examining the coincidence of enhanced short-wavelength sensitivity with blue tongues among lizards of this genus will provide further insight into the co-evolution of conspecific signals and whole-eye spectral sensitivity.

Place, publisher, year, edition, pages
The Company of Biologists , 2022. Vol. 225, no 11, article id jeb244317
Keywords [en]
Electroretinography, Opsins, Photoreceptors, Scincidae, Spectral sensitivity
National Category
Zoology Evolutionary Biology
Identifiers
URN: urn:nbn:se:umu:diva-198002DOI: 10.1242/JEB.244317ISI: 000811278900021PubMedID: 35582824Scopus ID: 2-s2.0-85131903228OAI: oai:DiVA.org:umu-198002DiVA, id: diva2:1682489
Available from: 2022-07-11 Created: 2022-07-11 Last updated: 2022-07-11Bibliographically approved

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Davies, Wayne I. L.

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